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Glutamate potentiates rice resistance to blast

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Abstract

Leaf blast, caused by the hemibiotrophic fungus Pyricularia oryzae, is the most important disease affecting rice production worldwide. The present study investigated the potential of using glutamate (Glu) to increase rice resistance to leaf blast. Rice plants (cultivar Metica-1) were non-supplied (−Glu) or supplied (10 mM) (+Glu) with Glu and non-inoculated or inoculated with P. oryzae. Leaf blast severity and the number of lesions per cm2 of leaf were significantly lower by 55 and 50%, respectively, for +Glu plants in comparison to -Glu plants at 96 h after inoculation (hai). The area under the leaf blast progress curve was significantly lower by 70% for +Glu plants in comparison to -Glu plants. For inoculated +Glu plants, the activities of chitinase, β-1-3-glucanase, phenylalanine ammonia-lyase, and polyphenoloxidases as well as the concentrations of total soluble phenolics and lignin-thioglycolic acid derivatives were significantly higher for inoculated +Glu plants in comparison to inoculated -Glu ones. The use of glutamate may become an alternative to be used in the management of rice blast in the context of a sustainable agriculture.

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Acknowledgments

Prof. Rodrigues thanks the “Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)” for his fellowship. This study was supported by grants from CNPq and FAPEMIG to Prof. Rodrigues. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

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Authors and Affiliations

  1. Departamento de Fitopatologia, Laboratório da Interação Planta-Patógeno, Universidade Federal de Viçosa, Viçosa, MG, 36570-900, Brazil

    Carla Silva Dias, Jonas Alberto Rios, Andersom Milech Einhardt, Lillian Matias Oliveira, Joicy Aparecida Alves Chaves & Fabrício A. Rodrigues

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  1. Carla Silva Dias
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  2. Jonas Alberto Rios
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  3. Andersom Milech Einhardt
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  4. Lillian Matias Oliveira
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  5. Joicy Aparecida Alves Chaves
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  6. Fabrício A. Rodrigues
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Correspondence to Fabrício A. Rodrigues.

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Dias, C.S., Rios, J.A., Einhardt, A.M. et al. Glutamate potentiates rice resistance to blast. Trop. plant pathol. 45, 136–142 (2020). https://doi.org/10.1007/s40858-019-00327-7

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